Multiple images display (slideshow) on wpInstalling Page under ProgressGauge bar in Inno Setup - image

Question

I have prepared simple script that displays image under ProgressGauge bar on wpInstalling Page.
But... I need more complex functionality.
What I need is multiple images show, each after X (e.g. 7) seconds (with loop when installation longer then X secs * number of images) or each after X (e.g. 10) percent of installation. I have tried to embed images display in ProgressGauge.Position, but I failed.
Here is what I have:
procedure CurPageChanged(CurPageID: Integer);
var
BmpFile: TBitmapImage;
begin
ExtractTemporaryFile('01.bmp');
ExtractTemporaryFile('02.bmp');
ExtractTemporaryFile('03.bmp');
if CurPageID = wpInstalling then
begin
BmpFile:= TBitmapImage.Create(WizardForm);
BmpFile.Bitmap.LoadFromFile(ExpandConstant('{tmp}\01.bmp'));
BmpFile.Width:= ScaleX(420);
BmpFile.Height:= ScaleY(180);
BmpFile.Left := WizardForm.ProgressGauge.Left + ScaleX(0);
BmpFile.Top := WizardForm.ProgressGauge.Top + ScaleY(35);
// BmpFile.Parent:= WizardForm.InstallingPage;
// BmpFile:= TBitmapImage.Create(WizardForm);
// BmpFile.Bitmap.LoadFromFile(ExpandConstant('{tmp}\03.bmp'));
// BmpFile.Width:= ScaleX(420);
// BmpFile.Height:= ScaleY(400);
// BmpFile.Left := WizardForm.ProgressGauge.Left + ScaleX(0);
// BmpFile.Top := WizardForm.ProgressGauge.Top + ScaleY(35);
// BmpFile.Parent:= WizardForm.InstallingPage;
// BmpFile:= TBitmapImage.Create(WizardForm);
// BmpFile.Bitmap.LoadFromFile(ExpandConstant('{tmp}\03.bmp'));
// BmpFile.Width:= ScaleX(420);
// BmpFile.Height:= ScaleY(400);
// BmpFile.Left := WizardForm.ProgressGauge.Left + ScaleX(0);
// BmpFile.Top := WizardForm.ProgressGauge.Top + ScaleY(35);
// BmpFile.Parent:= WizardForm.InstallingPage;
end;
end;
The goal is:
On the wpInstalling there should be X images displayed, every next per X seconds or after X percent of installation.

Answer 1

Since the ProgressGauge has no progress change events and there is no way to process setup application messages you will need to use the Windows API timer. This timer needs a callback function which you can't define in Inno Setup script unfortunately so you will need some external library to do this job for you. However there's the InnoCallback library which can do exactly this.
For the following code copy the InnoCallback.dll library into your setup directory, merge this code with your Inno Setup script and implement some kind of a slideshow page turning in the OnSlideTimer event which will be called periodically (with the current settings each second).
[Files]
Source: "InnoCallback.dll"; DestDir: "{tmp}"; Flags: dontcopy
[code]
var
TimerID: Integer;
type
TTimerProc = procedure(Wnd: HWND; Msg: UINT; TimerID: UINT_PTR;
SysTime: DWORD);
function WrapTimerProc(Callback: TTimerProc; ParamCount: Integer): LongWord;
external 'wrapcallback#files:InnoCallback.dll stdcall';
function SetTimer(hWnd: HWND; nIDEvent, uElapse: UINT;
lpTimerFunc: UINT): UINT; external 'SetTimer#user32.dll stdcall';
function KillTimer(hWnd: HWND; uIDEvent: UINT): BOOL;
external 'KillTimer#user32.dll stdcall';
procedure OnSlideTimer(Wnd: HWND; Msg: UINT; TimerID: UINT_PTR;
SysTime: DWORD);
begin
{ here you can turn your slideshow pages; use some variable to store the }
{ current index of the slide you are on, note that this procedure is called }
{ periodically each 1000 ms (see below why), so here you can also check the }
{ progress value, if you want to }
end;
procedure StartSlideTimer;
var
TimerCallback: LongWord;
begin
TimerCallback := WrapTimerProc(#OnSlideTimer, 4);
{ third parameter here is the timer's timeout value in milliseconds }
TimerID := SetTimer(0, 0, 1000, TimerCallback);
end;
procedure KillSlideTimer;
begin
if TimerID <> 0 then
begin
if KillTimer(0, TimerID) then
TimerID := 0;
end;
end;
function InitializeSetup: Boolean;
begin
Result := True;
TimerID := 0;
end;
procedure DeinitializeSetup;
begin
KillSlideTimer;
end;
procedure CurPageChanged(CurPageID: Integer);
begin
if CurPageID = wpInstalling then
StartSlideTimer
else
KillSlideTimer;
end;